In polymer chemistry, a comonomer refers to a polymerizable precursor to a copolymer aside from the principal monomer. In some cases, only small amounts of a comonomer are employed, in other cases substantial amounts of comonomers are used. Furthermore, in some cases, the comonomers are statistically incorporated within the polymer chain, whereas in other cases, they aggregate. The distribution of comonomers is referred to as the "blockiness" of a copolymer.
In this conversion, 1-hexene (red) is a comonomer in the formation of a modified polyethylene.
Comonomers are often employed to improve the plastification of polymeric materials, i.e. the flexibility of the polymer. Unlike traditional plasticizers, comonomers are not leachable.
Styrenics
In other cases, comonomers are used to introduce crosslinking. Divinylbenzene, for example, when copolymerized with styrene, gives a crosslinked polystyrene.[2]
^Chum, P. Steve; Swogger, Kurt W. (2008). "Olefin polymer technologi geography and Recent Progress at the Dow Chemical Company". Progress in Polymer Science. 33 (8): 797–819. doi:10.1016/j.progpolymsci.2008.05.003.
^Hans-Georg Elias "Plastics, General Survey"in Ullmann's Encyclopedia of Industrial Chemistry 2005, Wiley-VCH, Weinheim. doi:10.1002/14356007.a20_543
^Penzel, Erich; Ballard, Nicholas; Asua, José M. (2018). "Polyacrylates". Ullmann's Encyclopedia of Industrial Chemistry. pp. 1–20. doi:10.1002/14356007.a21_157.pub2. ISBN9783527306732.
July 27, 2023
comonomer, polymer, chemistry, comonomer, refers, polymerizable, precursor, copolymer, aside, from, principal, monomer, some, cases, only, small, amounts, comonomer, employed, other, cases, substantial, amounts, comonomers, used, furthermore, some, cases, como. In polymer chemistry a comonomer refers to a polymerizable precursor to a copolymer aside from the principal monomer In some cases only small amounts of a comonomer are employed in other cases substantial amounts of comonomers are used Furthermore in some cases the comonomers are statistically incorporated within the polymer chain whereas in other cases they aggregate The distribution of comonomers is referred to as the blockiness of a copolymer Contents 1 Polyolefins 2 Styrenics 3 Acrylates 4 ReferencesPolyolefins Edit1 Octene 1 hexene and 1 butene are used comonomers in the manufacture of polyethylenes The advantages to such copolymers has led to a focus on catalysts that facilitate the incorporation of these comonomers e g constrained geometry complexes 1 In this conversion 1 hexene red is a comonomer in the formation of a modified polyethylene Comonomers are often employed to improve the plastification of polymeric materials i e the flexibility of the polymer Unlike traditional plasticizers comonomers are not leachable Styrenics EditIn other cases comonomers are used to introduce crosslinking Divinylbenzene for example when copolymerized with styrene gives a crosslinked polystyrene 2 Acrylates EditThe homopolymers of acrylate esters e g butyl acrylate have few applications Copolymers however have many applications They are produced by copolymerization of alkyl acrylates and one or more of the following comonomers methyl methacrylate styrene acrylonitrile vinyl acetate vinyl chloride vinylidene chloride and butadiene 3 References Edit Chum P Steve Swogger Kurt W 2008 Olefin polymer technologi geography and Recent Progress at the Dow Chemical Company Progress in Polymer Science 33 8 797 819 doi 10 1016 j progpolymsci 2008 05 003 Hans Georg Elias Plastics General Survey in Ullmann s Encyclopedia of Industrial Chemistry 2005 Wiley VCH Weinheim doi 10 1002 14356007 a20 543 Penzel Erich Ballard Nicholas Asua Jose M 2018 Polyacrylates Ullmann s Encyclopedia of Industrial Chemistry pp 1 20 doi 10 1002 14356007 a21 157 pub2 ISBN 9783527306732 Retrieved from https en wikipedia org w index php title Comonomer amp oldid 1138589458, wikipedia, wiki, book, books, library,
